durty first version of optimized rendering
resolve misc bug, render optimisation is on the way
recreate menu shadow and floating window shadow
reimplement fading effect when switching notebook windows
improve monitoring of compositor
improve monitoring of compositor
reimplement optimization of rendering with direct and composited area
implement a trivial forecast of best swap buffer method
implement XShape support
Cleanup XShape code
replace all double rectangle to integer rectangle
take children order within split::prepare_render
re-enable notebook dropdowns menu
update & fix notebook fading
move background from ram pixmap to X11 pixmap
improve debug outputs
implement shape and transparancy for unmanaged windows
fix dropdown_menu::_is_durty
reenable all popup
fix some screen damage event with unmanaged windows